Mortising-machine.



E. BIEDER.

MORTISING MACHINE. APPLICATION man JUNE 12. |914.

Patented Jan.1,'1918.

IIIESI SES... lllllllillilllllel. III-ll UNITED sTATEs "PATENT oEEIoE.

ERNEST BIEDER, or LAKE ronEsT, ILLINOIS.

MoRTIsING-MACHINE.

Specication of Letters Patent. i i

Application filed J une 12, 1914.V Serial No. 844,782.

To all whom t may concern Be it lmown that I, ERNEST BIEDER, a citizen of the United States, residing at Lake Forest, in the county of Lake and State of'lllinois, have invented certain new and useful Improvements in Mortising-llachines, of which the following is a specification.

This invention relates to boring or sawing machines and more particularly to a device of this nature which embodies an endless belt or chain of cutting blades for mortising or cutting substantially rectangular holes or openings in boards or timbers.

An object of this invention lis the provision of a machine of this nature wherein the supporting or bracing legs are resiliently connected to the sawing 0r cutting parts of the machine so that the incision of the cutting' blades into the timber may be more iinely regulated and 'adjusted by manual pressure and also so that the cutting blades will be heldk out of engagement with the timber unless pressure is applied thereto.

Anotherv object of this invention is the provision of means for regulating the tension of the belt which carries the cutting blades. p

lVith the foregoing and other objects in view, this inventionconsists in such novel features of construction, combination and arrangement of parts as will be hereinafter more fully described, illustrated in the accompanying drawings and claimed.

In describing the invention in detail, reference will be had to the accompanying drawings wherein like characters of reference designate like or corresponding parts throughout the several views, and in which- Figure 1 is a side elevation of the improved mortising machine showing parts thereof broken away,

Fig. 2 is a side elevation of the mortising machine, parts being broken away,

Fig.` 3 is a detail view-0f a part of the means for regulating the tension of the blade carrying belt,

Fig. 4 is a plan view of a part of the bracing or supporting legs structure,

Fig. 5 is a central sectional View through the handle of the mortising machine,

Fig. 6 is a central sectional view? through the handle of the mortising machine showing the opposite half to that shown in Fig. 5,

Fig. 7 is a detail perspective view of one of the cutting blades,

. Fig. 8 is a plan view of one of the cutting blades, and

Fig. 9 Vis aV detail viewrof one of thevsidc blades used in the present invention.

Referring more particularly to the draw- Patented Jan. 1, 19,18.

ings, l designates a block which has a rod 2 depending therefrom. The rod 2 has a bearing block 3 removably attached to its lower end, which bearinv'bloclr has its lower end ,.bifurcated as at 4, lsee Fig. forming arms 5 and 6, which have the pulley 7 seated therebetween. Each of the arms 5 and 6 are provided with slots 8 which have the ends of the shaft 9 slidably seated therein. The shaft 9 has the pulley 7 rotatably mounted e thereupon.

A second pulley 10 is rotatably mountedv upon a shaft 11, which shaft is carried by the upper -end of the block 1.v A belt 12 passes about. the pulleys 7 and 10 and carries Va plurality of cutting blades 14 upon its outer surface. The cutting blades 14 are shown in the drawings as being formed of two substantially triangularly Vshaped sections joined together and having their edges beveled, as is clearly shown in Figs. 7 and 8 of the drawings. y rlhe cutting blades 14 are removably attached to the belt 12 so that when one of them becomes broken, worn out or dull, it may be removed and a good blade substituted in lieu thereof. The cutting 'blades 14 are secured to the belt 12, so that the apex of the triangular sections or the pointed ends will enter the timber being mortised upon operation of the machine.

vThe shaft 11 has gear-wheell mounted upon its outer end, whichmeshes with a second gear 16. In thedrawings, the gear -16 is shown of much greater' diameterthan the gear 15, so as to increase the speed of travel or the number of revolutions of the q gear 15 with respect to the number of revolutions of the gear 16. The gear 16 is rotatably mounted upon a shaft 17 which is carried by the block 1 and it has a handle 18 secured thereto by Vbolts 19. The bolts 19k are attached to the handle 18 and the gear 16 in spaced relation, so as to" prevent pivotal movement of the handle during the operation of the same.

A handle 20 which is preferably constructy ed of resilient material suchas sheet metal is secured to the block 1 having itsupper end formed so as to lbe conveniently gripped by the hand of the person operating the device. The handle 20 has depressions 21 formed shown in Fig. 2 ofthe drawings, and the' handle is secured to the block in any suitable Y,

manner, such as by screws, nails or the like,

and by thel frictionalY engagementA between the ends of the handle'and the block 1.

The rod 2 is slidably mounted in an opening 22 which is formed in a bar 23. The bar 23 has its ends bifurcated as at 24, and supporting or bracing legs 25 are. pivotally connected to the bifurcated ends 24 by means of bolts 26, as is clearly shown in Fig. 4 of the drawings. The rod 2 has a spring 27 wound thereabout, one end of which spring engages the lower end of the block 1, and the other end of which engages the bar 23 and presses downwardly upon the block, causing the bearing block 3 which is connected to the lower end of the rod 2 and the parts carried thereby, to be normally held out of engagement with the timber which is to be mortised, when pressure is not applied to the handle 20, or normally holding the bearing block and the parts carried thereby in the position which is shown in Fig. 2 of the drawings.

The tension of the belt 12 is regulated by adjusting screws 28 which are mounted in the bearing block 3 and have their lower endg engaging the shaft 9. By various adjustments of the pins 28, the tension of the belt 12 is regulated and the position of the shaft 9 in the slots 8 also regulated.

The side teeth or blades 29 provide for an accurate cutting of square holes, since by depending entirely upon the blades 14, two of the opposite side of the holes or openings which would be cut by the machine, would be slightly beveled or inclined, in view of the formation of the blades 14, whereas by the provision of these teeth or blades 29, an accurate mortising of the timber will be assured.

When it is desired to cut an opening or a substantially rectangularly shaped mortise or hole in a timber, the mortising machine which has heretofore been described is positioned so that the supporting legs 25 will engage the surface of the timber in which .the opening is to be made. The spring. 27 will hold the cutting teeth 14 which are mounted upon the outer surface of the belt 12 out of engagement with thev timber, as is clearly shown in Fig. 2, until pressure is applied tothe handle 20. When pressure is applied to the handle 20, it forces the rod 2 downwardly, and consequently the pulleys 7 and 10 and the belt 12, causing the teeth 14 vto bite into the timber. The rotation of the belt through the medium of (the handle 18 and the gears 15 and 16 will operate the copies of thilvpltelit` inayibe obtained for belt about the pulleys 7 and 10 causin the I cutting teeth to cutviwnto the wood an also to carrythe shavings or cuttings up and out of the opening which is being formed. Continued i pressure upon the handle 20 will cause thel blades to cut deeper into the v wood and the depth of the holes or openings'V which are being cut may be regulated.

From the foregoing description taken in connection withwthe `accompanying drawings, the advantages of the construction and of the method of operation of the improved mortising machine will be readily apparent to those skilled in the art lto which this in- -vention appertains and, while in the foregoing description, the principle of the operation of this invention has been described together with various features of construction, it is to be understood that certain minor vfeatures of construction, combination and arrangement of parts ymay be altered to suit practical conditions provided such. alterations are comprehended within the scope of what is claimed.

lVhat is claimed is:

' 1. A mortising machine including upper and lower bearing blocks, the lowerblock being bifurcated, a. pulley having's'tub axles movable in the bifurcated portions adjusting bolts engaging the said axles, a connecting rod between the bearing blocks, a pulley on the upper block, a supporting bar having an opening for receiving the connecting rod, a spring disposed 'betweenthe supporti ing bar andthe upper block for forcing the ,supporting bar normally outwardly,` a belt applied to the pulleys the belt having cutting knives, and supporting vlegs pivoted .to the ends of the supporting bar said legs being capable of adjustment by reason of the pivotal connection for regulating thetension of the spring when the .mortising machine is applied to the work.

2. In a mortising machine, spaced bearing 'blocks having pulleys rotatably carried thereby, an endless belt passing over said pulleys, cutting knives mounted upon the outer surface of said belt, a bar, a rod connecting said bearing blocks slidably mounted in the bar, supporting legs pivotally con- ERNEST RIEDER.

Witnesses Y VICTOR LAnsoN, BERNARD VAN AMERSFOORT.

ve cents each,.b'y addressing thev v-ema-minstener `it Intente.

Washington, D. 6. 

